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Gong X, Yang Y, Xu T, Yao D, Lin S, Chang W. Assessing the Anxiolytic and Relaxation Effects of Cinnamomum camphora Essential Oil in University Students: A Comparative Study of EEG, Physiological Measures, and Psychological Responses. Front Psychol 2024; 15:1423870. [PMID: 39131857 PMCID: PMC11312375 DOI: 10.3389/fpsyg.2024.1423870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Accepted: 07/17/2024] [Indexed: 08/13/2024] Open
Abstract
Background Cinnamomum camphora is a commercially important tree species in China, and it's also a common native tree in the forests of southern China. However, literature on the impact of Cinnamomum camphora essential oil (CCEO) on human psychophysiological activity is scarce. Hence, the primary objective of this study was to examine the effect of exposure to CCEO on the functioning of the human autonomic nervous system, electroencephalographic (EEG) activity, and emotional state. Methods Forty-three healthy university students participated. The data collected included heart rate (HR), blood pressure (BP), pulse rate, blood oxygen saturation (SpO2), electroencephalographic (EEG) activity, and the results of the Profile of Mood States (POMS) test. Results A drop in diastolic pressure (DBP) and pulse rate was also noticed after participants inhaled CCEO. Furthermore, EEG studies have demonstrated notable reductions in absolute beta (AB), absolute gamma (AG), absolute high beta (AHB), and relative gamma (RG) power spectra during exposure to CCEO. Conversely, the relative theta (RT) and power spectra values showed a significant increase. Additionally, the finding from POMS indicated that the fragrance evoked positive emotions and suppressed negative feelings. Conclusion The results suggest that exposure to CCEO may promote mental and physical relaxation, facilitate cognitive processes such as memory and attention, and enhance mood states.
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Affiliation(s)
- Xiangfei Gong
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yujun Yang
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Tong Xu
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Dongsheng Yao
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Shengyu Lin
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Weiyin Chang
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
- Laboratory of Virtual Teaching and Research on Forest Therapy Specialty of Taiwan Strait, Fujian Agriculture and Forestry University, Fuzhou, China
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Kim J, Park S, Kim H, Roh D, Kim DH. Effects of Phytoncide Fragrance on Resting-State Brain Activity in Mild Cognitive Impairment: A Randomized Double-Blind Controlled Study. JOURNAL OF INTEGRATIVE AND COMPLEMENTARY MEDICINE 2024. [PMID: 38530093 DOI: 10.1089/jicm.2023.0185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
Introduction: The therapeutic potential of phytoncide fragrances may be optimal for patients with mild cognitive impairment (MCI) that display complex symptomatology. This study aimed to explore the clinical value of phytoncide by evaluating its electrophysiological effects in patients with MCI. Materials and Methods: This was a double-blind, randomized controlled trial. A total of 24 community-dwelling patients were randomly assigned to either a phytoncide or no-odor group. Participants wore a dental mask, for 30 min at rest that had either the fragrance stimulus or water added to it. The quantitative electroencephalography (EEG) during the resting state was recorded before and after a single intervention. Results: There were significant interaction effects in absolute EEG-power values in the occipital (F = 6.52, p = 0.018) and parietal (F = 5.41, p = 0.030) left hemisphere at β frequency. Phytoncide odor significantly decreased low and high β activity in the occipital (corrected p = 0.009) and parietal (corrected p = 0.047) left hemisphere, respectively. In source localization, phytoncide odor significantly decreased deep source activation in the left inferior and middle frontal gyri at β 2 frequency band compared with the no-odor group (threshold = 4.25, p < 0.05). Conclusions: Reductions in β, indicative of anxiety, depression, and stress, suggest relief from emotion-related symptoms that are common in patients with MCI. Trial Registration: Clinical Trials Registry Korea (registration: KCT0007317).
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Affiliation(s)
- Jiheon Kim
- Department of Psychiatry, Chuncheon Sacred Heart Hospital, Chuncheon, Republic of Korea
- Mind-Neuromodulation Laboratory, College of Medicine, Hallym University, Chuncheon, Republic of Korea
| | - Seungchan Park
- Mind-Neuromodulation Laboratory, College of Medicine, Hallym University, Chuncheon, Republic of Korea
| | - Hansol Kim
- Mind-Neuromodulation Laboratory, College of Medicine, Hallym University, Chuncheon, Republic of Korea
| | - Daeyoung Roh
- Department of Psychiatry, Chuncheon Sacred Heart Hospital, Chuncheon, Republic of Korea
- Mind-Neuromodulation Laboratory, College of Medicine, Hallym University, Chuncheon, Republic of Korea
| | - Do Hoon Kim
- Department of Psychiatry, Chuncheon Sacred Heart Hospital, Chuncheon, Republic of Korea
- Mind-Neuromodulation Laboratory, College of Medicine, Hallym University, Chuncheon, Republic of Korea
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Komini A, Kokka I, Vlachakis D, Chrousos GP, Kanaka-Gantenbein C, Bacopoulou F. A Systematic Review on the Adult Alpha Brainwave Activity After Essential Oil Inhalation. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1425:545-553. [PMID: 37581828 DOI: 10.1007/978-3-031-31986-0_53] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/16/2023]
Abstract
Aroma extracts from plant species have been utilized since ancient times for a variety of discomforting circumstances. Aromatherapy is a recognized complementary therapeutic treatment performed in various ways such as massage or dermal application, with its main uses involving relaxation, pain relief, and stress management. Several studies have outlined that inhalation of fragrance may influence the brain function since their components can cross the blood-brain barrier and interact with central nervous system receptors. The aim of this review was to systematically present findings regarding alpha brain wave activity reported exclusively by electroencephalography. The study was conducted according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. The PubMed and Scopus databases were screened for relevant papers, based on specific eligibility criteria. The final step of the process resulted in 13 studies published between 1998 and 2021, using different essential oils. Most of the studies revealed the increase of alpha brainwave activity post-essential oil inhalation. Given the proven positive outcomes of increased alpha wave activity on several domains such as cognitive performance and better mental state, further research on the impact of essential oil inhalation is warranted.
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Affiliation(s)
- Asimina Komini
- Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Ioulia Kokka
- Outpatient Specialty Clinic for Obsessive Compulsive and Related Disorders, First Department of Psychiatry, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Dimitrios Vlachakis
- Laboratory of Genetics, Department of Biotechnology, School of Applied Biology and Biotechnology, Agricultural University of Athens, Athens, Greece
| | - George P Chrousos
- University Research Institute of Maternal and Child Health and Precision Medicine, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Christina Kanaka-Gantenbein
- First Department of Pediatrics, Medical School, National and Kapodistrian University of Athens, Aghia Sophia Children's Hospital, Athens, Greece
| | - Flora Bacopoulou
- Center for Adolescent Medicine, and UNESCO Chair in Adolescent Health Care, First Department of Pediatrics, Medical School, National and Kapodistrian University of Athens, Aghia Sophia Children's Hospital, Athens, Greece.
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Hong M, Jang H, Bo S, Kim M, Deepa P, Park J, Sowndhararajan K, Kim S. Changes in Human Electroencephalographic Activity in Response to Agastache rugosa Essential Oil Exposure. Behav Sci (Basel) 2022; 12:bs12070238. [PMID: 35877308 PMCID: PMC9311756 DOI: 10.3390/bs12070238] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 07/10/2022] [Accepted: 07/14/2022] [Indexed: 02/04/2023] Open
Abstract
Agastache rugosa (Korean mint) is an important medicinal and aromatic plant and its aerial parts have a pleasant fragrance. A. rugosa leaves are used as an ingredient in salads and soups for enhancing the aroma and taste of foods in Korea. However, there is no report on the influence of the aroma of A. rugosa on human psychophysiological activity. Therefore, the present study aimed to investigate the effect of exposure to the essential oil of Korean A. rugosa on human electroencephalographic (EEG) activity. The essential oil of A. rugosa was isolated using steam distillation extraction and its composition was determined by gas chromatography and mass spectrometry (GC–MS) analysis. In the EEG study, 38 healthy volunteers (19 men and 19 women) participated. The EEG readings were analyzed for 25 EEG indices from 29 electrodes placed on the scalp according to the international 10–20 system. The major component in the essential oil of A. rugosa was estragole (89.49%) followed by D-limonene (3.40%), menthone (1.80%), and pulegone (1.86%). In the EEG study, significant decreases in absolute theta (AT) and relative theta (RT) power spectra were observed during the exposure to A. rugosa essential oil when compared to that of no odor exposure. Whereas relative alpha (RA), relative slow alpha (RSA), spectral edge frequency 50% (SEF50), and spectral edge frequency 50% of alpha (ASEF) power spectra values significantly increased. These results reveal that the EEG power spectra changes incurred during the exposure to the essential oil of A. rugosa may be associated with the enhancement of freshness and concentration states of the human brain.
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Affiliation(s)
- Minji Hong
- School of Natural Resources and Environmental Science, Kangwon National University, Chuncheon 24341, Korea; (M.H.); (H.J.); (S.B.); (M.K.); (P.D.)
| | - Hyejeong Jang
- School of Natural Resources and Environmental Science, Kangwon National University, Chuncheon 24341, Korea; (M.H.); (H.J.); (S.B.); (M.K.); (P.D.)
| | - Sela Bo
- School of Natural Resources and Environmental Science, Kangwon National University, Chuncheon 24341, Korea; (M.H.); (H.J.); (S.B.); (M.K.); (P.D.)
| | - Minju Kim
- School of Natural Resources and Environmental Science, Kangwon National University, Chuncheon 24341, Korea; (M.H.); (H.J.); (S.B.); (M.K.); (P.D.)
| | - Ponnuvel Deepa
- School of Natural Resources and Environmental Science, Kangwon National University, Chuncheon 24341, Korea; (M.H.); (H.J.); (S.B.); (M.K.); (P.D.)
| | - Jiyea Park
- Bigsome Inc., 501 Jinju-daero, Jinju 52828, Korea;
| | | | - Songmun Kim
- School of Natural Resources and Environmental Science, Kangwon National University, Chuncheon 24341, Korea; (M.H.); (H.J.); (S.B.); (M.K.); (P.D.)
- Correspondence: ; Tel.: +82-33-250-6447
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Explant, Medium, and Plant Growth Regulator (PGR) Affect Induction and Proliferation of Callus in Abies koreana. FORESTS 2021. [DOI: 10.3390/f12101388] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Korean fir (Abies koreana E.H. Wilson) is a unique Pinaceae tree species endemic in Korea. In recent years, it is believed that climate change has caused many of them to die. Therefore, it has become extremely important to protect and preserve this tree species. In this study, the possibility of callus induction using different explants, media, and plant growth regulators (PGRs) was studied. After the dormancy period in May 2020, needles and stem segments that grew from the leaf buds as the explants were collected from one-year-old shoots. The explants were disinfected and subsequently transferred to culture media supplemented with different combinations of auxins and cytokinins. These explants were cultured in the dark in a culture room with a 16 h photoperiod, day/night temperature of 24/18 °C, and 80% relative humidity. After 8 weeks, significant differences were observed in the callus induction and proliferation, as affected by the explant type, basic medium, and PGR. The stem segments were more suitable as the explants for callus induction than needles were. Furthermore, fluffy calli suitable for differentiating the regeneration buds were observed on the calli induced from stem segments. The Murashige and Skoog (MS) medium was the most effective of the three media used in this study, namely MS, Douglas fir cotyledon revised (DCR), and Quoirin and Lepoivre (LP) media, with the highest callus induction ratio of stem segments being 100.0%. The highest fresh callus weight was also observed on the MS medium (819.3 mg). Moreover, the PGR combinations of α-naphthaleneacetic acid (NAA), 2,4-dichlorophenoxyacetic acid (2,4-D), and 6-benzylaminopurine (6-BA) consistently exerted a positive influence on callus induction throughout this study. In addition, the advantages of these two kinds of PGR were reflected in callus proliferation. The callus proliferation ratio reached 1147.6% as compared to the initial fresh weight, with a high concentration of 2,4-D (3.0 mg·L−1). In conclusion, the MS medium was optimal for callus induction on the stem segment explants, and 2,4-D promoted callus induction as well as an increased proliferation ratio of callus in A. koreana.
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Kim M, Chhoeun TB, Kim T, Sowndhararajan K, Kim S. The gender variation on the electroencephalographic activity in response to the exposure of black pepper essential oil from Kampong Cham, Cambodia. FLAVOUR FRAG J 2020. [DOI: 10.1002/ffj.3560] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Minju Kim
- School of Natural Resources and Environmental Science Kangwon National University Chuncheon Korea
| | - Tith Bun Chhoeun
- Department of Agronomy Kampong Cham National School of Agriculture Kampong Cham Cambodia
| | - Taehee Kim
- Gangwondo Agricultural Research and Extension Services Agro‐Food Research Institute Chuncheon Korea
| | | | - Songmun Kim
- School of Natural Resources and Environmental Science Kangwon National University Chuncheon Korea
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Kim M, Song J, Nishi K, Sowndhararajan K, Kim S. Changes in the Electroencephalographic Activity in Response to Odors Produced by Organic Compounds. J PSYCHOPHYSIOL 2020. [DOI: 10.1027/0269-8803/a000234] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Abstract. Volatile organic compounds are widely used to manufacture various products in addition to research purposes. They play an important role in the air quality of outdoor and indoor with a pleasant or unpleasant odor. It is well known that the odor of chemicals with different structures can affect brain functions differently. In general, organic compounds are mainly characterized by their functional groups. Acetic acid, acetaldehyde, acetone, and acetonitrile are widely used laboratory chemicals with the same methyl group, but different functional groups. Hence, the present study was aimed to investigate whether the exposure of these four chemicals (10%) exhibits the same electroencephalographic (EEG) activity or different. For this purpose, the EEG was recorded in 20 male healthy volunteers. The EEG was recorded from 32 electrodes located on the scalp, based on the International 10–20 system with modified combinatorial nomenclature. The results indicated that tested subjects are less sensitive to acetic acid odor than other three chemicals. The absolute theta activity significantly increased at Cp5 and F8 regions, and the relative mid-beta (RMB) significantly decreased at Fc1 region during the exposure of acetic acid. On the other hand, acetaldehyde, acetone, and acetonitrile produced EEG changes in many indices such as relative theta, relative gamma, relative high beta, relative beta, relative slow beta, the ratio of alpha to high beta, and spectral edge frequencies. However, there was no significant change in the absolute wave activity. Although acetaldehyde, acetone, and acetonitrile odors affected almost similar EEG indices, they exhibited changes in different brain regions. The variations in the EEG activity of these chemicals may be due to the activation of different olfactory receptors, odor characteristics, and structural arrangements.
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Affiliation(s)
- Minju Kim
- School of Natural Resources and Environmental Science, Kangwon National University, Gangwon-do, Republic of Korea
| | - Jieun Song
- School of Natural Resources and Environmental Science, Kangwon National University, Gangwon-do, Republic of Korea
| | - Kosuke Nishi
- Department of Bioscience, Ehime University, Japan
| | - Kandhasamy Sowndhararajan
- School of Natural Resources and Environmental Science, Kangwon National University, Gangwon-do, Republic of Korea
- Department of Botany, Kongunadu Arts and Science College, Coimbatore, Tamil Nadu, India
| | - Songmun Kim
- School of Natural Resources and Environmental Science, Kangwon National University, Gangwon-do, Republic of Korea
- Gangwon Perfume Alchemy Ltd. Co., Gangwon-do, Republic of Korea
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Kang JH. A Study on the Electrophysiological Response of the Cerebral Cortex by Olfactory Stimulation: Alpha Activity. KOREAN JOURNAL OF CLINICAL LABORATORY SCIENCE 2019. [DOI: 10.15324/kjcls.2019.51.4.462] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Ji-Hyuk Kang
- Department of Biomedical Laboratory Science, College of Health and Medical Science, Daejeon University, Daejeon, Korea
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Olfactory Stimulation Effect of Aldehydes, Nonanal, and Decanal on the Human Electroencephalographic Activity, According to Nostril Variation. Biomedicines 2019; 7:biomedicines7030057. [PMID: 31370211 PMCID: PMC6784002 DOI: 10.3390/biomedicines7030057] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 07/20/2019] [Accepted: 07/27/2019] [Indexed: 01/31/2023] Open
Abstract
Fragrances play a pivotal role in humans' psychological and physiological functions through the olfactory system. Aldehydes are important organic compounds with a variety of fragrance notes. Particularly, nonanal (C9) and decanal (C10) aldehydes are important natural fragrant components used to enhance floral, as well as citrus notes in perfumery products. In general, each nostril of the human nose is tuned to smell certain odor molecules better than others due to slight turbinate swelling between the nostrils. Hence, the objective of the present investigation was aimed to evaluate the influence of binasal and uninasal inhalations of C9 and C10 aldehydes on human electroencephalographic (EEG) activity. Twenty healthy participants (10 males and 10 females) participated in this study. The EEG readings were recorded from 8 electrodes (QEEG-8 system) according to the International 10-20 System. The results revealed that C10 exposure exhibited significantly different EEG changes, during binasal and uninasal inhalations. In different brain regions, C10 odor markedly decreased the absolute alpha and absolute beta power spectra. In regards to C9 odor, significant changes of EEG power spectra were noticed only during binasal inhalation. In addition, C10 mainly produced changes at the left parietal site (P3) than other brain sites. In conclusion, the variations in EEG activities of C9 and C10 aldehydes might be owing to their characteristic fragrance quality, as well as the influence of nostril differences.
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Park KH, Kim HJ, Oh B, Seo M, Lee E, Ha J. Evaluation of human electroencephalogram change for sensory effects of fragrance. Skin Res Technol 2019; 25:526-531. [PMID: 30762249 DOI: 10.1111/srt.12682] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 12/10/2018] [Accepted: 01/12/2019] [Indexed: 12/23/2022]
Abstract
BACKGROUND The stabilizing effect of lavender and the arousal effect of peppermint essential oils are acknowledged and used widely in aromatherapy and the cosmetics industry. However, no evaluation method confirms the effects of essential oils through quantitative and objective electroencephalogram (EEG) results; instead, only a psychological and subjective method exists. Therefore, this study aims to create a new emotional cosmetic evaluation paradigm using EEG values. Moreover, it enables quantitative interpretation of the results in addition to the subjective survey outcomes. METHODS For this study, 12 healthy female Korean participants were recruited and three fragrances were used. The EEG results were collected for 3 minutes (1 minute each before, during, and after inhalation of every fragrance). RESULTS The quantitative EEG outcomes indicate changes in the participant's brainwaves before and after inhalation. Significant changes in the EEG were observed. Based on the results, the effects of fragrances were confirmed to be stabilizing for lavender, and arousing for peppermint and coffee aroma. Furthermore, the subjective questionnaire results indicate similar tendency as that of the quantitative EEG results. CONCLUSION In addition to psychological and subjective assessments, our emotional evaluation method can verify the cosmetic fragrance effects through quantitative and objective results.
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Affiliation(s)
| | - Hyun Joo Kim
- Skin Research Institute, IEC Korea, Suwon, Korea
| | - Bobae Oh
- Skin Research Institute, IEC Korea, Suwon, Korea
| | - Minji Seo
- Skin Research Institute, IEC Korea, Suwon, Korea
| | - Eunyoung Lee
- Skin Research Institute, IEC Korea, Suwon, Korea
| | - Jaehyoun Ha
- Skin Research Institute, IEC Korea, Suwon, Korea
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A time series analysis to investigate the effect of inhalation of aldehyde C10 on the human EEG activity. Eur J Integr Med 2019. [DOI: 10.1016/j.eujim.2018.11.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Kim M, Sowndhararajan K, Park SJ, Kim S. Effect of inhalation of isomers, (+)-α-pinene and (+)-β-pinene on human electroencephalographic activity according to gender difference. Eur J Integr Med 2018. [DOI: 10.1016/j.eujim.2017.11.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Gender Differences in Electroencephalographic Activity in Response to the Earthy Odorants Geosmin and 2-Methylisoborneol. APPLIED SCIENCES-BASEL 2017. [DOI: 10.3390/app7090876] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Sowndhararajan K, Seo M, Kim M, Kim H, Kim S. Effect of essential oil and supercritical carbon dioxide extract from the root of Angelica gigas on human EEG activity. Complement Ther Clin Pract 2017; 28:161-168. [PMID: 28779924 DOI: 10.1016/j.ctcp.2017.05.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 05/08/2017] [Accepted: 05/23/2017] [Indexed: 10/19/2022]
Abstract
OBJECTIVES The present study aimed to investigate the effect of inhalation of essential oil (EO) and supercritical carbon dioxide extract (SC-CO2) from the root of A. gigas on human electroencephalographic (EEG) activity. MATERIALS AND METHODS For this purpose, the EO was obtained from the root of A. gigas by steam distillation and SC-CO2 was obtained at 50 °C and 400 bar for 1 h. The EEG readings were recorded using the QEEG-8 system from 8 electrode sites according to the International 10-20 system. RESULTS In the EEG study, the absolute low beta (left temporal and left parietal) activity significantly increased during the inhalation of EO. In the case of SC-CO2 inhalation, there was no significant change in absolute waves. CONCLUSION The results revealed that the EO of A. gigas root produced significant changes in the absolute low beta activity and these changes may enhance the language learning abilities of human brain.
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Affiliation(s)
- Kandhasamy Sowndhararajan
- School of Natural Resources and Environmental Sciences, Kangwon National University, Chuncheon 24341, Gangwon-do, Republic of Korea
| | - Min Seo
- School of Natural Resources and Environmental Sciences, Kangwon National University, Chuncheon 24341, Gangwon-do, Republic of Korea
| | - Minju Kim
- School of Natural Resources and Environmental Sciences, Kangwon National University, Chuncheon 24341, Gangwon-do, Republic of Korea
| | - Heeyeon Kim
- Agro-Food Research Institute, Gangwondo Agriculture Research and Extension Services, Chuncheon 24203, Gangwon-do, Republic of Korea
| | - Songmun Kim
- School of Natural Resources and Environmental Sciences, Kangwon National University, Chuncheon 24341, Gangwon-do, Republic of Korea.
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